Statistics for Management and Economics, Abbreviated, 9th ed.
... 1. M. 2. Confidence Interval Estimator of. When n = As2. 1>n1 + s2. 2>n2B2. As2. 1>n1B2 n1 - 1. + As2. 2>n2B2 n2 - 1. (x1 - x2. ) ; t a>2B a s2. 1 n1. + s2. 2. 
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